Patients receive cyclophosphamide IV over 1 hour on days -6 and -5 and methylprednisolone IV daily on days -4 to -1. Patients also undergo total body irradiation twice a day on days -4 to -1. Lymphocyte-depleted PBSCs or bone marrow is reinfused on day 0. Patients receive G-CSF SC daily beginning on day 0 and continuing until blood counts have recovered for 3 days.